#include <bits/stdc++.h>
using namespace std;

ifstream fin("flip.in");
ofstream fout("flip.out");

int n, m, a[20];
int b[20][20];

int main()
{
    int i, j, s, stot, smax = INT_MIN;
    fin >> n >> m;
    for (i = 1; i <= n; i++)
        for (j = 1; j <= m; j++)
            fin >> b[i][j];

    while (a[0] == 0)
    {
        stot = 0;
        for (i = 1; i <= n; i++)
        {
            s = 0;
            for (j = 1; j <= m; j++)
                if (a[j] == 0) s += b[i][j];
                else s -= b[i][j];
            stot += abs(s);
        }
        smax = max(smax, stot);

        /// gen next sir binar
        for (i = m; a[i] == 1; i--)
            a[i] = 0;
        a[i] = 1;
    }
    fout << smax << "\n";
    return 0;
}